CN110137032B - Load driving device and load driving method - Google Patents
Load driving device and load driving method Download PDFInfo
- Publication number
- CN110137032B CN110137032B CN201910108838.5A CN201910108838A CN110137032B CN 110137032 B CN110137032 B CN 110137032B CN 201910108838 A CN201910108838 A CN 201910108838A CN 110137032 B CN110137032 B CN 110137032B
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- contact
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- current
- load driving
- relay
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
- H01H47/02—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for modifying the operation of the relay
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H11/00—Apparatus or processes specially adapted for the manufacture of electric switches
- H01H11/04—Apparatus or processes specially adapted for the manufacture of electric switches of switch contacts
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
- H01H47/001—Functional circuits, e.g. logic, sequencing, interlocking circuits
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
- H01H47/002—Monitoring or fail-safe circuits
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
- H02P25/16—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the circuit arrangement or by the kind of wiring
- H02P25/18—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the circuit arrangement or by the kind of wiring with arrangements for switching the windings, e.g. with mechanical switches or relays
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/04—Means for indicating condition of the switching device
- H01H2071/044—Monitoring, detection or measuring systems to establish the end of life of the switching device, can also contain other on-line monitoring systems, e.g. for detecting mechanical failures
Abstract
The invention provides a load driving device and a load driving method, the load driving device includes: a drive control unit (48) that outputs a close command for closing the contact (28) to the first drive unit (24), and alternately and repeatedly outputs an open command and a close command for opening the contact (28) to the first drive unit (24) until the contact (28) is turned on; a retry number acquisition unit (50) that acquires, as a retry number, the number of times that the drive control unit (48) repeats the open command and the close command until the contact (28) is connected after outputting the close command to the first drive unit (24); a usable period estimation unit (58) estimates the future usable period of the first relay (22) on the basis of the number of retries.
Description
Technical Field
The present invention relates to a load driving device provided with a relay and a load driving method.
Background
Japanese patent laid-open No. 2012-070484 discloses an on-off control device that acquires the cumulative use time, cumulative energization time, and cumulative number of times of opening and closing of an opening and closing device as data for diagnosing the life of the opening and closing device that controls the on-off of a load.
Since the degree of deterioration of the relay (opening/closing device) also changes depending on the magnitude of the flowing current when the contact is in the closed state, the technique disclosed in japanese patent application laid-open No. 2012-070484 has the following problems: in a device such as a dynamic braking circuit in which the current is different for each operation, the degree of deterioration of the contact cannot be estimated, and the accuracy of estimating the time during which the relay can be used in the future is low.
Disclosure of Invention
The present invention has been made to solve the above-described problems, and an object thereof is to provide a load driving device and a load driving method capable of accurately estimating the degree of deterioration in the measurement time of a relay and the time that can be used in the future.
An aspect of the present invention is a load driving device including a relay, including: a driving unit that drives the relay so that the contact of the relay is in a closed state or an open state; a drive control unit that outputs a close command for turning the contact into a closed state to the drive unit, and alternately and repeatedly outputs an open command for turning the contact into an open state and the close command to the drive unit until the contact is turned on; a retry number acquisition unit configured to acquire, as a retry number, a number of times that the drive control unit repeats the open command and the close command until the contact is turned on after the close command is output to the drive unit; and a usable period estimating unit configured to estimate a usable period of the relay from the number of retries.
An aspect of the present invention is a load driving method performed by a load driving apparatus including a relay, the load driving apparatus including a driving unit that drives the relay so that a contact of the relay is in a closed state or an open state, the load driving method including: a drive control step of outputting a close command for turning the contact into a closed state to the drive unit, and alternately and repeatedly outputting an open command for turning the contact into an open state and the close command to the drive unit until the contact is turned on; a retry number acquisition step of acquiring, as a retry number, a number of times that the open command and the close command are repeated until the contact is turned on after the close command is output to the driving unit in the drive control step; and a usable period estimating step of estimating a usable period of the relay based on the number of retries.
According to the present invention, the time that can be used in the future of the relay can be estimated with high accuracy.
The above objects, features and advantages will be readily understood from the following description of the embodiments with reference to the accompanying drawings.
Drawings
Fig. 1 is a block diagram showing a configuration of a motor drive device.
Fig. 2A is a block diagram showing a functional configuration of the first control unit, and fig. 2B is a block diagram showing a functional configuration of the second control unit.
Fig. 3 is a flowchart showing a flow of processing performed by the first control unit and the second control unit to estimate the available periods of the first relay and the second relay.
Fig. 4 is a flowchart showing a flow of processing performed by the first control unit and the second control unit to estimate the available periods of the first relay and the second relay.
Fig. 5 is a graph schematically showing the degree of deterioration of the contact points with respect to the number of times the contact points of the first relay and the second relay are opened and closed.
Fig. 6 is a timing chart schematically showing the current degree of deterioration of the contact and the progress state of deterioration of the contact according to the magnitude of the flowing current.
Detailed Description
[ embodiment ]
[ Structure of Motor drive device ]
Fig. 1 is a block diagram showing a configuration of a motor drive device 10. The motor drive apparatus 10 controls electric power supplied from the power source 12 to the motor 14.
The motor drive device 10 has a switching circuit 16, a main power supply circuit 18, and a dynamic braking circuit 20. The switching circuit 16 is PWM-controlled by a motor control device, not shown, that controls the motor 14, and controls the electric power supplied to the motor 14. The motor drive device 10 constitutes a load drive device 80, and the motor 14 constitutes a load 82.
The main power supply circuit 18 includes a power supply 12, a first relay 22, a first drive unit 24, and a first control unit 26. The first relay 22 is provided between the power source 12 and the switch circuit 16, and switches a state of a circuit connecting the power source 12 and the switch circuit 16 between a conductive state and a non-conductive state. The first relay 22 has a contact 28 and a coil 30. The contact 28 is turned on when the power source 12 and the switch circuit 16 are turned off, and is turned off when the power source 12 and the switch circuit 16 are turned on. When a current flows through the coil 30, the coil 30 is excited, and the contact 28 is closed by the magnetic force of the coil 30. On the other hand, when the current supplied to the coil 30 is stopped, the coil 30 is in a non-excited state, and the contact 28 is opened by the biasing force of a biasing member, not shown.
The first driving unit 24 sets the coil 30 to an excited state by applying a current to the coil 30, and sets the coil 30 to a non-excited state by stopping the current applied to the coil 30. The first driving portion 24 is controlled by the first control portion 26 to control the current flowing through the coil 30.
When the coil 30 is in the excited state and the contact 28 is closed, the power source 12 and the switching circuit 16 are connected. The power supplied to the motor 14 is controlled by a switching circuit 16. Thereby, the motor 14 is driven.
The dynamic braking circuit 20 includes a resistor 32, a second relay 34, a second driving unit 36, and a second control unit 38. The second relay 34 is provided between the motor 14 and the resistor 32, and switches a state of a circuit connecting the motor 14 and the resistor 32 between a conductive state and a non-conductive state. The second relay 34 has a contact 40 and a coil 42. The contact 40 is in a conductive state between the motor 14 and the resistor 32 when closed, and in a non-conductive state between the motor 14 and the resistor 32 when opened. When a current flows through the coil 42, the coil 42 is excited, and the contact 40 is closed by the magnetic force of the coil 42. On the other hand, when the current supplied to the coil 42 is stopped, the coil 42 is in a non-excited state, and the contact 40 is opened by the biasing force of a biasing member, not shown.
The second driving unit 36 sets the coil 42 to an excited state by applying a current to the coil 42, and sets the coil 42 to a non-excited state by stopping the current applied to the coil 42. The second driving section 36 is controlled by the second control section 38, thereby controlling the current flowing through the coil 42.
When the coil 42 is in the excited state and the contact 40 is closed, the motor 14 and the resistor 32 are connected. The power supplied to the motor 14 is controlled by a switching circuit 16. Thereby, the motor 14 is driven.
When the brake is applied to the motor 14, the supply of electric power from the switching circuit 16 to the motor 14 is stopped, the coil 42 is excited, and the contact 40 is closed, thereby connecting the motor 14 and the resistor 32. This causes the motor 14 to generate a rotation resistance, and causes the motor 14 to generate a braking force.
The notification unit 44 notifies the operator by displaying an image, characters, and the like on the screen. The notification unit 44 may notify the operator by sound. The notification unit 44 notifies the operator based on the control performed by the first control unit 26 and the second control unit 38.
An ammeter 46 is provided between the switching circuit 16 and the motor 14. The ammeter 46 detects the flowing current through the contact 28 of the first relay 22 and the flowing current through the contact 40 of the second relay 34.
[ constitution of first control part ]
Fig. 2A is a block diagram showing a functional configuration of the first control unit 26. The first control unit 26 includes a drive control unit 48, a retry number acquisition unit 50, a response time acquisition unit 52, an energization current acquisition unit 54, an energization current integration unit 56, a usable period estimation unit 58, and a notification control unit 60.
When power is supplied to the motor 14, the drive control unit 48 outputs a shutdown command to the first drive unit 24. The first driving unit 24 causes a current to flow through the coil 30 and closes the contact 28 based on the closing command. When the motor 14 is not supplied with electric power, the drive control unit 48 outputs an open command to the first drive unit 24. The first driving unit 24 stops the current to the coil 30 based on the opening command, and opens the contact 28. When the current flowing through the ammeter 46 is not detected (the contact 28 is not in conduction) even after a predetermined time has elapsed after the close command is output to the first driving unit 24, the drive control unit 48 repeatedly outputs the close command and the open command to the first driving unit 24 alternately until the current flowing through the first driving unit 24 is detected (the contact 28 is in conduction).
The retry number acquisition unit 50 counts and acquires the number of times of repeatedly outputting the open command and the close command (hereinafter, referred to as retry number) after the drive control unit 48 first outputs the close command to turn on the contact 28. Further, the number of retries counts the set of the open instruction and the close instruction as 1 time.
The response time acquisition unit 52 measures a time (hereinafter, referred to as a response time) from when the drive control unit 48 outputs the off command to the first drive unit 24 until the ammeter 46 detects the current (until the contact 28 is turned on). The response time is a time from when the drive control unit 48 outputs the close command to when the contact 28 is turned on, and when the contact 28 is not turned on even if the drive control unit 48 outputs the close command, the response time is not measured.
The current acquisition unit 54 acquires the current detected by the ammeter 46. The current integrating unit 56 integrates the current flowing through the contact 28 from the start of use of the first relay 22 to the present, and stores the integrated value (hereinafter referred to as current integrated value).
Available period estimation unit 58 estimates a period in which first relay 22 can be used in the future (hereinafter referred to as an available period). The available period is estimated based on the number of retries, the energization current, the response time, and the energization current integrated value. The estimation of the available period is described in detail later.
The notification control unit 60 controls the notification unit 44 to display an image, a character, or a sound for notifying the operator of the estimated available period when the integrated value of the energization current is equal to or more than the set current, the response time is equal to or more than the set time, or the number of retries is equal to or more than the set number of times.
[ constitution of second control part ]
Fig. 2B is a block diagram showing a functional configuration of the second control unit 38. The second control unit 38 includes a drive control unit 62, a retry number acquisition unit 64, a response time acquisition unit 66, an energization current acquisition unit 68, an energization current integration unit 70, a usable period estimation unit 72, and a notification control unit 74.
When the resistor 32 is connected to the motor 14, the drive control unit 62 outputs a turn-off command to the second drive unit 36. The second driving unit 36 causes a current to flow through the coil 42 in response to the closing command, and closes the contact 40. When the resistor 32 is not connected to the motor 14, the drive control unit 62 outputs an on command to the second drive unit 36. The second driving unit 36 stops the current to the coil 42 and opens the contact 40 based on the opening command. When the current flowing through the ammeter 46 is not detected (the contact 40 is not in conduction) even after a predetermined time has elapsed after the close command is output to the second driving unit 36, the drive control unit 62 repeatedly outputs the close command and the open command to the second driving unit 36 alternately until the current flowing through the second driving unit 36 is detected (the contact 40 is in conduction).
The retry number acquisition unit 64 counts and acquires the number of times (hereinafter, referred to as retry number) that the drive control unit 62 repeatedly outputs the open command and the close command after the close command is first output in order to turn on the contact 40. Further, the number of retries counts the set of the open instruction and the close instruction as 1 time.
The response time acquisition unit 66 measures the response time from when the drive control unit 62 outputs the closing command to the second drive unit 36 until the ammeter 46 detects the current (until the contact 40 is turned on). The response time is a time from when the drive control unit 62 outputs the close command to when the contact 40 is turned on, and when the contact 40 is not turned on even if the drive control unit 62 outputs the close command, the response time is not measured.
The current obtaining unit 68 obtains the current detected by the ammeter 46. The current integrating unit 70 integrates the current flowing through the contact 40 from the start of use of the second relay 34 to the present, and stores the integrated value (hereinafter referred to as a current integrated value).
Available period estimation unit 72 estimates a period in which second relay 34 can be used in the future (hereinafter referred to as an available period). The available period is estimated based on the number of retries, the energization current, the response time, and the energization current integrated value. The estimation of the available period is described in detail later.
The notification control unit 74 controls the notification unit 44 to display an image or a character or to generate a sound for notifying the operator of the estimated available period when the integrated value of the energization current is equal to or more than the set current, the response time is equal to or more than the set time, or the number of retries is equal to or more than the set number of times.
[ available period estimation treatment ]
Fig. 3 and 4 are flowcharts showing the flow of the available period estimation process of the first relay 22 and the second relay 34 performed by the first control unit 26 and the second control unit 38. The available period estimation processing of the first relay 22 performed by the first control unit 26 and the available period estimation processing of the second relay 34 performed by the second control unit 38 are different from each other only in terms of the target of the available period estimation, and almost the same processing is performed.
In step S1, the drive control unit 48 (drive control unit 62) outputs a close command to the first drive unit 24 (second drive unit 36), and the process proceeds to step S2. In step S2, the response time acquisition section 52 (response time acquisition section 66) starts measurement of the response time, and moves to step S3.
In step S3, the drive control unit 48 (drive control unit 62) determines whether or not the contact 28 (contact 40) is on before a predetermined time has elapsed since the closing instruction was output to the first drive unit 24 (second drive unit 36). When the contact 28 (contact 40) is conductive, the process proceeds to step S7, and when the contact 28 (contact 40) is nonconductive, the process proceeds to step S4.
In step S4, the response time obtaining unit 52 (response time obtaining unit 66) resets the response time, and the process proceeds to step S5. By resetting the response time in step S4, the response time is not measured when contact 28 (contact 40) is not conducting even if a constant time has elapsed since the closing instruction was output in drive control unit 48 (drive control unit 62).
In step S5, the drive controller 48 (drive controller 62) outputs an open command to the first driver 24 (second driver 36), and the process proceeds to step S6. In step S6, the retry number acquisition unit 50 increments the last value of the retry number, and returns to step S1.
In step S7, in which it is determined in step S3 that the contact 28 (contact 40) is on from the time when the close command is output to the first driver 24 (second driver 36) until the constant time elapses, the response time acquirer 52 (response time acquirer 66) ends the measurement of the response time, and the process proceeds to step S8.
In step S8, the current integrating unit 56 (current integrating unit 70) integrates the current flowing through the contact 28 (contact 40), and the process proceeds to step S9. The current-carrying integrated value is obtained by adding the time integral of the current carried when the contact 28 (contact 40) is turned on to the current-carrying integrated value until the previous time when the contact 28 (contact 40) was turned on.
In step S9, the available period estimating unit 58 (available period estimating unit 72) estimates the available period of the first relay 22 (second relay 34), and the process proceeds to step S10. The available period is estimated to be shorter as the available period is shorter as the number of retries is larger, shorter as the energization current is larger, shorter as the available period is longer as the response time is longer, and shorter as the integrated value of the energization current is larger.
In step S10, notification controller 60 (notification controller 74) sets the set current, the set time, and the number of times of setting to be used in the subsequent processing, and the process proceeds to step S11. The larger the current is, the smaller the setting current is, the shorter the setting time is, and the smaller the number of times of setting is. The set current, set time, and set frequency set by the notification control unit 60 may be the same as or different from the set current, set time, and set frequency set by the notification control unit 74.
In step S11, the available period estimating unit 58 (available period estimating unit 72) determines whether or not the integrated value of the energization current is equal to or larger than the set current. When the integrated value of the energization current is equal to or larger than the set current, the process proceeds to step S15. When the integrated value of the energization current is smaller than the set current, the process proceeds to step S12.
In step S12, the available period estimating unit 58 (available period estimating unit 72) determines whether or not the response time is equal to or longer than a set time. If the response time is equal to or longer than the set time, the process proceeds to step S15. When the response time is less than the set time, the process proceeds to step S13.
In step S13, the available period estimating unit 58 (available period estimating unit 72) determines whether or not the number of retries is equal to or greater than a set number. If the number of retries is equal to or greater than the set number, the process proceeds to step S15. If the number of retries is smaller than the set number, the process proceeds to step S14.
In step S14, the available period estimating unit 58 (available period estimating unit 72) determines whether or not the available period is shorter than a predetermined set period. When the available period is smaller than the set period, the process proceeds to step S15. When the available period is equal to or longer than the set period, the process is terminated. The setting period used for the determination by the available period estimating unit 58 may be the same as or different from the setting period used for the determination by the available period estimating unit 72.
In step S15, the available period estimating unit 58 (available period estimating unit 72) estimates the available period of the first relay 22 (second relay 34), and the notification control unit 60 (notification control unit 74) controls the notification unit 44 to notify the operator of the estimated available period, and ends the process. Next, the estimation of the available period of the first relay 22 (second relay 34) by the available period estimation portion 58 (available period estimation portion 72) will be described in detail.
[ estimation of usable time period ]
Fig. 5 is a graph schematically showing the degree of deterioration of the contact 28 (contact 40) with respect to the number of times the contact 28 (contact 40) of the first relay 22 (second relay 34) is opened and closed. Each time the contact 28 (contact 40) is opened and closed, the contact surface of the contact 28 (contact 40) is consumed, and the contact 28 (contact 40) is corroded, so that the deterioration of the contact 28 (contact 40) progresses. As the conduction current flowing through the contact 28 (contact 40) increases, the deterioration of the contact 28 (contact 40) progresses more rapidly, and as shown in fig. 5, the higher the conduction current is, the higher the degree of deterioration of the contact 28 (contact 40) is, even if the number of times the contact 28 (contact 40) is opened and closed is the same. In other words, the degree of deterioration of the contact 28 (contact 40) cannot be accurately estimated from only the number of times the contact 28 (contact 40) is opened and closed.
Therefore, the degree of deterioration of the contact 28 (contact 40) is estimated based on the number of retries. As the degree of deterioration of the contact 28 (contact 40) increases, the contact failure of the contact 28 (contact 40) tends to occur, and the number of retries tends to increase. Therefore, the deterioration degree of the contact 28 (the contact 40) can be accurately estimated from the number of retries.
In addition to the number of retries, the degree of deterioration of the contact 28 (contact 40) may be estimated from the response time. If the deterioration of the contact 28 (contact 40) progresses, it takes time to open and close the contact 28 (contact 40) due to corrosion of the contact 28 (contact 40). The accuracy of estimating the degree of degradation of contact 28 (contact 40) can be improved by using the response time in addition to the retry number.
In addition to the number of retries, the degree of deterioration of contact 28 (contact 40) may be estimated from the integrated value of the current-carrying current. As described above, the larger the current flowing through the contact 28 (contact 40), the higher the degree of deterioration of the contact 28 (contact 40). In addition to the retry number, the accuracy of estimating the degree of deterioration of contact 28 (contact 40) can be improved by using the current-carrying integrated value.
The available period of the first relay 22 (second relay 34) is estimated based on the estimated degree of deterioration and the magnitude of the current currently flowing through the contact 28 (contact 40). Fig. 6 is a timing chart schematically showing the current degree of deterioration of contact 28 (contact 40) and the state of progress of deterioration of contact 28 (contact 40) according to the magnitude of the flowing current. As described above, the larger the current flowing through the contact 28 (contact 40), the faster the deterioration of the contact 28 (contact 40) progresses, and as shown in fig. 6, even if the current degree of deterioration is the same, the larger the current, the shorter the period until the degree of deterioration of the contact 28 (contact 40) reaches the replacement reference of the first relay 22 (second relay 34), in other words, the usable period of the first relay 22 (second relay 34). The future deterioration speed of contact point 28 (contact point 40) can be estimated from the magnitude of the current currently flowing through contact point 28 (contact point 40). This can improve the accuracy of estimating the usable period of the first relay 22 (second relay 34).
Further, the usable period of the first relay 22 (second relay 34) may be estimated using a predetermined speed as the deterioration speed. In addition, the available period of the first relay 22 (second relay 34) can be estimated using the deterioration rate in the past. Further, it is also possible to estimate the future degradation rate of the contact 28 (contact 40) using an average value of the magnitudes of the current flowing through the contact 28 (contact 40) in the past, or the like, and to estimate the available period of the first relay 22 (second relay 34) using the estimated degradation rate.
[ Effect ]
The degree of deterioration of the first relay 22 and the second relay 34 also changes depending on the magnitude of the current flowing when the contacts 28 and 40 are in the closed state. Therefore, the degree of deterioration of the first relay 22 and the second relay 34 estimated from the number of times the contacts 28 and the contacts 40 are opened and closed, and the like, is low in accuracy. In particular, in the dynamic braking circuit 20, the current flowing through the contact 40 of the second relay 34 differs every time the second relay 34 is operated, and therefore the degree of deterioration of the contact 40 cannot be estimated.
In the present embodiment, the available period estimating unit 58 (available period estimating unit 72) estimates the available period of the first relay 22 (second relay 34) based on the number of retries. The degree of deterioration of the contact 28 (contact 40) can be estimated with high accuracy based on the number of retries, and the accuracy of estimation of the usable period of the first relay 22 (second relay 34) can be improved by using the estimated degree of deterioration.
In the present embodiment, the available period estimating unit 58 (available period estimating unit 72) estimates the available period of the first relay 22 (second relay 34) based on the number of retries and the magnitude of the current flowing through the contact 28 (contact 40). Based on the magnitude of the current currently flowing through the contact 28 (contact 40), the future degradation rate of the contact 28 (contact 40) can be estimated with high accuracy, and the estimation accuracy of the available period of the first relay 22 (second relay 34) can be improved.
In the present embodiment, the available period estimating unit 58 (available period estimating unit 72) estimates the available period of the first relay 22 (second relay 34) based on at least one of the response time and the integrated value of the current supply current in addition to the number of retries. The degree of deterioration of the contact 28 (contact 40) can be estimated from the response time and the current-carrying current integrated value, and the degree of deterioration of the contact 28 (contact 40) can be estimated with high accuracy by using the response time and the current-carrying current integrated value in addition to the number of retries, and the accuracy of estimation of the usable period of the first relay 22 (second relay 34) can be improved by using the estimated degree of deterioration.
In the present embodiment, the estimated available period of the first relay 22 (second relay 34) is notified to the operator by the notification unit 44. This makes it possible to notify the operator to recognize the available period of the first relay 22 (second relay 34).
In the present embodiment, when the number of retries is equal to or greater than the set number, the notification unit 44 notifies the operator of the available period of the first relay 22 (second relay 34). When the retry number is equal to or greater than the set number, or the response time is equal to or greater than the set time, or the energization current integrated value is equal to or greater than the set current, the degree of deterioration of the first relay 22 (second relay 34) is high, and the available period of the first relay 22 (second relay 34) is short. Thus, when the available period of the first relay 22 (second relay 34) is long, the operator is not notified, so that the operator does not feel the trouble of frequently notifying, and when the available period of the first relay 22 (second relay 34) is short, the operator can be notified to recognize the available period of the first relay 22 (second relay 34).
In the present embodiment, the number of times, the time, and the current are set according to the magnitude of the current currently flowing through the contact 28 (the contact 40). The larger the magnitude of the current currently flowing through the contact 28 (contact 40), the shorter the available period of the first relay 22 (second relay 34) is. Since the number of times of setting, the time of setting, and the current of setting can be set according to the available period of the first relay 22 (second relay 34), the operator can be notified to recognize the available period of the first relay 22 (second relay 34) when the available period of the first relay 22 (second relay 34) is shortened.
[ technical idea obtained by the embodiment ]
The technical idea that can be grasped from the above-described embodiments is described below.
The load driving device 80 provided with the relays 22 and 34 includes: driving units 24 and 36 for driving the relays 22 and 34 so that the contacts 28 and 40 of the relays 22 and 34 are in a closed state or an open state; drive control units 48 and 62 for outputting a close command for closing the contacts 28 and 40 to the drive units 24 and 36, and alternately and repeatedly outputting an open command for opening the contacts 28 and 40 and the close command to the drive units 24 and 36 until the contacts 28 and 40 are turned on; retry number acquisition units 50 and 64 configured to acquire, as a retry number, the number of times until the contacts 28 and 40 are turned on after the drive control units 48 and 62 output the close command to the drive units 24 and 36 and then the open command and the close command are repeatedly output; and available period estimating units 58 and 72 for estimating a future available period of the relays 22 and 34 based on the number of retries. This can estimate the degree of deterioration of the contacts 28, 40 of the relays 22, 34, and improve the estimation accuracy of the usable period.
The load driving device 80 may include conduction current obtaining units 54 and 68 that obtain conduction currents for conducting the contacts 28 and 40, and the available period estimating units 58 and 72 may estimate the available period based on the number of retries and the conduction currents. This improves the accuracy of estimating the available period of the relays 22 and 34.
The load driving device 80 may include a notification unit 44 configured to notify the operator of the available period. This makes it possible to notify the operator to recognize the available period of the relays 22 and 34.
As the load driving device 80, the notification unit 44 may notify the operator of the available period when the number of retries is equal to or greater than a set number. Thus, since the operator is not notified when the available period of the relays 22 and 34 is long, the operator does not feel the trouble of frequently notifying, and when the available period of the relays 22 and 34 is short, the operator is notified to recognize the available period of the relays 22 and 34.
The load driving device 80 may include conduction current acquisition units 54 and 68 that acquire conduction currents of the contacts 28 and 40, and the notification unit 44 may set the set number of times based on the conduction currents. Thus, when the available period of the relays 22 and 34 is short, the operator can be notified to recognize the available period of the relays 22 and 34.
The load driving device 80 may include: response time acquiring units 52 and 66 for acquiring response times from when the drive control units 48 and 62 output the close command to the drive units 24 and 36 to when the contacts 28 and 40 are turned on; current acquisition units 54 and 68 for acquiring current for energizing the contacts 28 and 40; and an energization current integrating unit 56, 70 that integrates the energization current to calculate an energization current integrated value, wherein the available period estimating unit 58, 72 estimates the available period based on at least one of the response time, the energization current, and the energization current integrated value, in addition to the retry number. This improves the accuracy of estimating the available period of the relays 22 and 34.
The load driving device 80 may include a notification unit 44 configured to notify the operator of the available period. This makes it possible to notify the operator to recognize the available period of the relays 22 and 34.
The load driving device 80 may notify the available period to an operator when the number of retries is equal to or greater than a set number of times, the response time is equal to or greater than a set time, or the integrated value of the energization current is equal to or greater than a set current. Thus, since the operator is not notified when the available period of the relays 22 and 34 is long, the operator does not feel the trouble of frequently notifying, and when the available period of the relays 22 and 34 is short, the operator can be notified to recognize the available period of the relays 22 and 34.
In the load driving device 80, the notification unit 44 may set the set number of times, the set time, or the set current according to the energization current. This makes it possible to notify the operator to recognize the available period of the relays 22 and 34 when the available period of the relays 22 and 34 is shortened.
As the load driving device 80, the notification unit 44 may notify the operator of the available period when the available period is smaller than a set period. Thus, when the available period of the relays 22 and 34 is shortened, the operator can be notified to recognize the available period of the relays 22 and 34.
As a load driving method in a load driving device 80 including relays 22 and 34, the load driving device 80 includes driving units 24 and 36 that drive the relays 22 and 34 so that contacts 28 and 40 of the relays 22 and 34 are in a closed state or an open state, and the load driving method includes: a drive control step of outputting a close command to close the contacts 28 and 40 to the drive units 24 and 36, and alternately and repeatedly outputting an open command to open the contacts 28 and 40 and the close command to the drive units 24 and 36 until the contacts 28 and 40 are turned on; a retry number acquisition step of acquiring, as a retry number, the number of times until the contacts 28 and 40 are turned on after the closing command is output to the driving units 24 and 36 in the driving control step and the opening command and the closing command are repeatedly output; and a usable period estimating step of estimating a usable period of the relays 22 and 34 based on the number of retries. This improves the accuracy of estimating the available period of the relays 22 and 34.
The load driving method may further include a current-carrying-current obtaining step of obtaining a current carrying the contacts 28 and 40, and the available-period estimating step may estimate the available period based on the number of retries and the current carrying current. This improves the accuracy of estimating the available period of the relays 22 and 34.
As the load driving method, the load driving device 80 may include a notification unit 44 that notifies an operator, and the load driving method may include a notification control step of controlling the notification unit 44 to notify the operator of the available period. This makes it possible to notify the operator to recognize the available period of the relays 22 and 34.
As the load driving method, when the number of retries is equal to or greater than a set number in the notification control step, the notification unit 44 may be controlled to notify the operator of the available period. Thus, since the operator is not notified when the available period of the relays 22 and 34 is long, the operator does not feel the trouble of frequently notifying, and when the available period of the relays 22 and 34 is short, the operator is notified to recognize the available period of the relays 22 and 34.
As the load driving method, a current-carrying-current obtaining step of obtaining a current carried by the contacts 28 and 40 may be provided, and the notification control step may set the set number of times based on the current carried. This makes it possible to notify the operator to recognize the available period of the relays 22 and 34 when the available period of the relays 22 and 34 is shortened.
Claims (16)
1. A load driving device provided with a relay, comprising:
a drive unit that drives the relay so that a contact of the relay is in a closed state or an open state;
a drive control unit that outputs a close command for turning the contact into a closed state to the drive unit, and alternately and repeatedly outputs an open command for turning the contact into an open state and the close command to the drive unit until the contact is turned on;
a retry number acquisition unit configured to acquire, as a retry number, a number of times that the drive control unit repeats the open command and the close command until the contact is turned on after the drive control unit outputs the close command to the drive unit; and
and a usable period estimating unit for estimating a usable period of the relay from the number of retries.
2. The load driving apparatus according to claim 1,
comprises a current acquisition unit for acquiring a current for energizing the contact,
the available period estimating unit estimates the available period based on the retry number and the current.
3. The load driving apparatus according to claim 1 or 2,
the device has a notification unit for notifying the operator of the available period.
4. The load driving apparatus according to claim 3,
when the number of retries is equal to or more than a set number, the notification unit notifies the operator of the available period.
5. The load driving apparatus according to claim 4,
a current-carrying current acquisition unit for acquiring a current carried by the contact,
the notification unit sets the set number of times based on the energization current.
6. The load driving device according to claim 1, comprising:
a response time acquiring unit that acquires a response time from when the drive control unit outputs the close command to the drive unit until the contact is turned on;
an energization current obtaining unit that obtains an energization current for energizing the contact; and
an energization current integrating unit for integrating the energization current to calculate an energization current integrated value,
the available period estimating unit estimates the available period based on at least one of the response time, the current flow and the current flow integrated value, in addition to the retry number.
7. The load driving apparatus according to claim 6,
the device has a notification unit for notifying the operator of the available period.
8. The load driving apparatus according to claim 7,
the notifying unit notifies the operator of the available period when the number of retries is equal to or more than a set number of times, the response time is equal to or more than a set time, or the integrated value of the energization current is equal to or more than a set current.
9. The load driving apparatus according to claim 8,
the notification unit sets the set number of times, the set time, or the set current according to the energization current.
10. The load driving apparatus according to claim 3,
when the available period is smaller than a set period, the notification unit notifies an operator of the available period.
11. The load driving apparatus according to claim 7,
when the available period is smaller than a set period, the notification unit notifies an operator of the available period.
12. A load driving method using a load driving device provided with a relay, characterized in that,
the load driving device includes a driving unit that drives the relay so that a contact of the relay is in a closed state or an open state,
the load driving method includes:
a drive control step of outputting a close command for turning the contact into a closed state to the drive unit, and alternately and repeatedly outputting an open command for turning the contact into an open state and the close command to the drive unit until the contact is turned on;
a retry number acquisition step of acquiring, as a retry number, a number of times that the open command and the close command are repeated until the contact is turned on after the close command is output to the driving unit in the drive control step; and
and a usable period estimating step of estimating a usable period of the relay based on the number of retries.
13. The load driving method according to claim 12,
an energizing current obtaining step of obtaining an energizing current for energizing the contact,
in the usable period estimating step, the usable period is estimated based on the number of retries and the current supply.
14. The load driving method according to claim 12 or 13,
the load driving device includes a notification unit for notifying an operator,
the load driving method includes a notification control step of controlling the notification unit to notify the operator of the available period.
15. The load driving method according to claim 14,
when the number of retries is equal to or greater than a set number, the notification control step controls the notification unit to notify the operator of the available period.
16. The load driving method according to claim 15,
an energizing current obtaining step of obtaining an energizing current of the contact,
in the notification control step, the set number of times is set according to the energization current.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2018020593A JP6600021B2 (en) | 2018-02-08 | 2018-02-08 | Load driving device and load driving method |
| JP2018-020593 | 2018-02-08 |
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| Publication Number | Publication Date |
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| CN110137032A CN110137032A (en) | 2019-08-16 |
| CN110137032B true CN110137032B (en) | 2020-07-07 |
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| CN201910108838.5A Active CN110137032B (en) | 2018-02-08 | 2019-02-03 | Load driving device and load driving method |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US11043345B2 (en) |
| JP (1) | JP6600021B2 (en) |
| CN (1) | CN110137032B (en) |
| DE (1) | DE102019000868B4 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP7205187B2 (en) * | 2018-11-21 | 2023-01-17 | 富士電機株式会社 | Apparatus, power supply, method and program |
| CN113157015B (en) * | 2020-01-22 | 2022-05-24 | 广州汽车集团股份有限公司 | Thermal management system testing method, platform, computer equipment and readable storage medium |
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Also Published As
| Publication number | Publication date |
|---|---|
| DE102019000868A1 (en) | 2019-08-08 |
| JP6600021B2 (en) | 2019-10-30 |
| DE102019000868B4 (en) | 2021-04-01 |
| JP2019140754A (en) | 2019-08-22 |
| US11043345B2 (en) | 2021-06-22 |
| US20190244779A1 (en) | 2019-08-08 |
| CN110137032A (en) | 2019-08-16 |
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